CN102105417A - Method for producing nickel manganese cobalt spinel ferrite having low permeation loss, and nickel manganese cobalt spinel ferrite produced by same - Google Patents
Method for producing nickel manganese cobalt spinel ferrite having low permeation loss, and nickel manganese cobalt spinel ferrite produced by same Download PDFInfo
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Abstract
The present invention relates to a method for producing spinel ferrite having a low permeation loss and a low dielectric loss which can be widely used as a material for high frequency (MHz) electronic components, and to spinel ferrite produced by the method. The method for producing spinel ferrite according to the present invention includes the steps of: preparing nickel oxide, cobalt oxide, manganese oxide, and iron oxide; wet-mixing the nickel oxide, cobalt oxide, manganese oxide, and iron oxide in methanol; taking powders from the mixture of nickel oxide, cobalt oxide, manganese oxide, and iron oxide, and drying the powders; crushing the dried powders; and heat-treating the powders, thereby producing nickel manganese cobalt spinel ferrite having a low permeation loss and a low dielectric loss.; The nickel manganese cobalt spinel ferrite produced in accordance with the method of the present invention can be widely used as a material for radiofrequency electronic components. The nickel manganese cobalt spinel ferrite produced in accordance with the method of the present invention and applied to an antenna may shorten the length of the antenna and improve the bandwidth, efficiency, and performance of the antenna.
Description
Technical field
The present invention relates to ferrite manufacture method and the ferrite made of method thus, relate in particular to and have low saturating magnetic loss and the low nickel manganese cobalt spinel ferrite manufacture method of electric losses and the nickel manganese cobalt spinel ferrite made of method thus of luring.
Background technology
Ferrite (ferrite) is to dissolve the sosoloid that alloying element or impurity form below 900 ℃ on stable body-centered cubic crystalline iron.Being the term on the iron and steel metallography, is to be the sosoloid of substrate with α iron, though therefore outward appearance is the same with pure iron, the element term of quoting institute's solid solution is called silicon ferrite or ferro-silicon.See it is single-phase at microscopically, and dissolve the partially mixed expression of pearlite of the ferritic white portion and the black of some carbon.Ferrite uses on the magnetic head of high-frequency transformer, cartridge, tape recorder and so on etc.
The common conduct of spinel ferrite in this ferrite (spinel ferrite) is at EMC iron core (EMC core), the high inductance Gong Naruto of low output loop, the material that uses on the low frequency fields such as wide band transformer, on the high frequency field more than the MHz,, use mainly as cartridge owing to high saturating magnetic loss.
Concrete, the spinel ferrite has high magnetic susceptibility below the MHz frequency, but also can have high saturating magnetic loss thus.Because such characteristic is suitable for difficulty because high loss exists on RF electrical fittings material, therefore use mainly as cartridge.
Such spinel ferrite manufacture method has the manufacturing by ball milling (ball mill), by precipitation (altogether Shen), by the manufacturing of, sol-gel (sol-gel), hydrothermal synthesis method etc.
Sol-gel be meant comprise from mobile gel to a series of process that embodies the colloidal sol transfer process of viscoelastic property like the semisolid, hydrothermal synthesis method is meant a metal-salt, oxide compound, oxyhydroxide or metal-powder under solution state or suspension state, utilize material interdependent characteristic is synthesized or enlarge the crystalline method by the concentration of solubleness, temperature, pressure and solvent.When coprecipitation was meant on the solution of similar two materials of chemical property coexistence any one species precipitate, another material is the phenomenon of coprecipitation also.
But the ferritic synthesis condition of spinel by sol-gel or hydrothermal method manufacturing is to need to adjust temperature, pressure, PH etc., thereby there are the problem of mass production difficulty thus in reproducibility and manufacture method harshness.
In addition, utilize coprecipitation to make the ferritic method of spinel compared with sol-gel, hydrothermal synthesis method possesses simple manufacturing process, therefore have and to be used for mass-produced advantage, but a large amount of waste water and waste take place in washing process, and the shared mass ratio of metal is low in as the metal-salt of making raw material, thereby has the high shortcoming of manufacturing cost.
Summary of the invention
Thereby, the objective of the invention is to guarantee that in order upward to be suitable at high frequency (more than the MHz), to provide low saturating magnetic loss and the low nickel manganese cobalt spinel ferrite manufacture method of electric losses that lures reach the nickel manganese cobalt spinel ferrite of method manufacturing thus as the electrical fittings material.
In addition, the object of the present invention is to provide manufacturing process simple and can fully guarantee the nickel manganese cobalt spinel ferrite manufacture method of reproducibility and the nickel manganese cobalt spinel ferrite made of method thus.
In addition, but another object of the present invention is to provide the not high nickel manganese cobalt spinel ferrite manufacture method of mass production and manufacturing cost and method and the nickel manganese cobalt spinel ferrite made thus.
Nickel manganese cobalt spinel ferrite manufacture method according to the present invention comprises the step that nickel oxide (NiO), cobalt oxide (Co3O4), manganese oxide (MnO) and ferric oxide (Fe2O3) are provided; Humidification mixes above-mentioned nickel oxide on methyl alcohol, above-mentioned cobalt oxide, the step of above-mentioned manganese oxide and above-mentioned ferric oxide; At above-mentioned nickel oxide, above-mentioned cobalt oxide takes out powder and the exsiccant step on above-mentioned manganese oxide and the above-mentioned ferric oxide mixture; Pulverize the step of above-mentioned exsiccant powder; And with the heat treated step of the powder of above-mentioned pulverizing.
The above-mentioned nickel oxide that provides, cobalt oxide, the step of manganese oxide and ferric oxide is with nickel oxide, cobalt oxide, manganese oxide and ferric oxide are respectively with 0.6～0.8: 0.005～0.007: 0.052～0.054: 1.04～1.06 mole (mol) is than being provided as feature, preferably, above-mentioned mol ratio can be with 0.7: 0.006: 0.053: 1.05 mol ratio provides.
The above-mentioned nickel oxide that provides, cobalt oxide, manganese oxide and ferric oxide step are with nickel oxide, cobalt oxide, manganese oxide and ferric oxide are with 0.6～0.8: 0.005～0.007: 0.057～0.059: 1.13～1.15 mole (mol) is than being provided as feature, preferably, above-mentioned mol ratio can be with 0.76: 0.006: 0.058: 1.14 mol ratio provides.
Above-mentioned humidification blended step was carried out 45 hours to 50 hours with ball milling (ball mill), preferably, carried out about 48 hours.
The step of above-mentioned dry mixed powder is carried out 11 hours to person 13 hours under 110 ℃ to 130 ℃ conditions, preferably, carried out 12 hours under 120 ℃ of conditions.
In the above-mentioned heat treatment step, thermal treatment for the first time is to carry out on 750 ℃ to 850 ℃, preferably, carries out on about 800 ℃.
Thermal treatment for the second time is to carry out on 1150 ℃ to 1250 ℃ after the above-mentioned thermal treatment first time, preferably, carries out on about 1200 ℃.
Thermal treatment for the second time is to carry out on 1050 ℃ to 1150 ℃ after the above-mentioned thermal treatment first time, and the best is to carry out on about 1100 ℃.
Thermal treatment for the third time is to carry out on 1200 ℃ to 1300 ℃ after the above-mentioned thermal treatment second time, preferably, carries out on about 1250 ℃.
Thermal treatment for the third time is to carry out on 1100 ℃ to 1200 ℃ after the above-mentioned thermal treatment second time, preferably, carries out on about 1150 ℃.
In addition, nickel manganese cobalt spinel ferrite according to the present invention is to be fabricated to feature according to above-mentioned manufacture method.
According to nickel manganese cobalt spinel ferrite manufacture method of the present invention and thus the nickel manganese cobalt spinel ferrite of method manufacturing have low saturating magnetic loss and the low electric losses that lures, therefore have on high frequency also the effect that can be suitable for as the electrical fittings material.
In addition, according to nickel manganese cobalt spinel ferrite manufacture method of the present invention and thus the nickel manganese cobalt spinel ferrite of method manufacturing have the effect that manufacturing process not only simply and fully guarantees reproducibility.
In addition, according to nickel manganese cobalt spinel ferrite manufacture method of the present invention and thus the nickel manganese cobalt spinel ferrite of method manufacturing have not only can mass production and the not high effect of manufacturing cost.
Description of drawings
Fig. 1 is the block diagram of expression according to the ferritic manufacture method of nickel manganese cobalt spinel of the present invention.
Fig. 2 is the block diagram of expression according to the ferritic manufacture method of nickel manganese cobalt spinel of first embodiment of the invention.
Fig. 3 is the chart of expression according to the compound permitivity variation of nickel manganese cobalt spinel ferrite in band territory between the 10MHz to 1GHz of first embodiment of the invention.
Fig. 4 is the chart of expression according to the compound magnetic susceptibility variation of nickel manganese cobalt spinel ferrite in band territory between the 10MHz to 1GHz of first embodiment of the invention.
Fig. 5 is that expression is suitable for the chart according to the performance of the antenna of the material of the ferritic antenna of nickel manganese cobalt spinel of first embodiment of the invention and suitable permitivity 40.
Fig. 6 is that expression is suitable for the form according to the performance of the antenna of the material of the ferritic antenna of nickel manganese cobalt spinel of first embodiment of the invention and suitable permitivity 40.
Fig. 7 is the block diagram of expression according to the ferritic manufacture method of nickel manganese cobalt spinel of second embodiment of the invention.
Fig. 8 is the chart of expression according to the variation of nickel manganese cobalt spinel ferrite compound (complex) magnetic susceptibility in the band territory between the 100MHz to 400MHz of second embodiment of the invention.
Embodiment
Describe most preferred embodiment of the present invention with reference to the accompanying drawings in detail, but the present invention does not limit or is defined as embodiment.As reference, the same in fact key element of prosign indication in the present invention, and illustrate can quoting the content of putting down in writing on other drawing under the above-mentioned rule, will omit in this content self-evident or repeatedly concerning the practitioner of the technical field of the invention.
Fig. 1 is the block diagram of expression according to nickel manganese cobalt spinel ferrite manufacture method of the present invention.
With reference to Fig. 1, nickel manganese cobalt spinel ferrite manufacture method of the present invention comprises provides nickel oxide, cobalt oxide, manganese oxide, the step of ferric oxide (S110); These are used ball milling humidification blended step (S120) in methyl alcohol; In mixture, take out powder and exsiccant step (S130); The step of crushed after being dried (S140); And powder step of heat treatment (S150) to pulverizing.
Specific embodiment to this is as follows.
Fig. 2 is the block diagram of expression according to the nickel manganese cobalt spinel ferrite manufacture method of first embodiment of the invention.
In order to provide nickel manganese cobalt spinel ferrite, nickel oxide, cobalt oxide, manganese oxide and ferric oxide according to first embodiment of the invention respectively with about 0.7: 0.006: 0.053: 1.05 mol ratio (mol) weighing provides (S210).
With ball milling (ball mill) these nickel oxide that provide, cobalt oxide, manganese oxide and ferric oxide humidification in methyl alcohol (MeOH) is mixed about 48 hours (S220).
In this nickel oxide, cobalt oxide, manganese oxide and ferric oxide mixture, take out powder (Fen Body) dry about 12 hours (S230) in about 120 ℃.
This exsiccant powder is pulverized, made it become small-particle (S240).
The powder of above-mentioned drying and crushing will be through a heat treatment process.(S250) carried out in thermal treatment for the first time under about 800 ℃ temperature.
Through thermal treatment for the first time, thereby can further promote the thermal treatment of carrying out the afterwards second time to reach spinel ferrite synthetic process in the thermal treatment for the third time.
Through heat treated powder will be through the heat treatment process second time for the first time, (S260) carried out in thermal treatment for the second time under about 1200 ℃ temperature.
Will be through heat treated powder for the second time through heat treatment process for the third time, (S270) carried out in thermal treatment for the third time under about 1250 ℃ temperature.
During through said process, nickel oxide, cobalt oxide, manganese oxide and ferric oxide synthesize the spinel ferrite.
At this, Fig. 2 is a first embodiment of the invention, under the suitable situation of the present invention of reality, be not limited to this, the mol ratio of nickel oxide, cobalt oxide, manganese oxide and ferric oxide can be provided to 1.06 with 0.6 to 0.8: 0.005 to 0.007: 0.052 to 0.054: 1.04, the humidification mixing time can be carried out 45 hours to 50 hours, and powder is under 110 ℃ to 130 ℃ conditions, can dry about 11 hours to 13 hours.
In addition, thermal treatment for the first time can be carried out under 750 ℃ to 850 ℃, and thermal treatment for the second time can be carried out under 1150 ℃ to 1250 ℃, and thermal treatment for the third time can be carried out under 1200 ℃ to 1300 ℃.
Fig. 3 is the chart of expression according to the compound permitivity variation of nickel manganese cobalt spinel ferrite in band territory between the 10MHz to 1GHz of first embodiment of the invention manufacturing.Permitivity (permittivity) is meant that the power (Coulomb force) of the physical properties that exists between two monopoles changes the general electric constant of representing in (electricdisplacement) relevant mathematical formula with the electromagnetic nature that brings by luring electric body along with insertion in electromagnetic field, be that expression lures electric body, the i.e. characteristic value of the electrical characteristic of nonconductor.
As shown in Figure 3, under 200MHz, has the electric losses that lures below 0.0004 according to the nickel manganese cobalt spinel ferrite of first embodiment of the invention as can be known.And permitivity is between 6 to 7.
Fig. 4 is the chart of expression according to the compound magnetic susceptibility variation of nickel manganese cobalt spinel ferrite in band territory between the 10MHz to 1GHz of first embodiment of the invention.
Magnetic susceptibility (permeability) is meant, the amount of the magnetic properties of expression material.Be meant the magneticflux-density that produces when magnetizing (magnetization) and the ratio of magneticstrength in a vacuum furtherly being subjected to influence of magnetic field.
Known to Fig. 4, be the saturating magnetic loss that under 200MHz, has below 0.04 according to the nickel manganese cobalt spinel ferrite of first embodiment of the invention.And magnetic susceptibility is expressed the characteristic between 9 to 10.
Represent that according to the nickel manganese cobalt spinel ferrite of first embodiment of the invention the ratio of magnetic susceptibility/permitivity is the characteristic between 1.3 to 1.75.
This nickel manganese cobalt spinel ferrite and general spinel ferrite characteristic when comparing according to first embodiment of the invention has the low-down characteristic of magnetic loss.In addition, magnetic susceptibility will be higher than permitivity.
And then, having low saturating magnetic loss and the low electric losses that lures according to the nickel manganese cobalt spinel ferrite of first embodiment of the invention manufacture method manufacturing, therefore can be suitable for as the electrical fittings material in the high frequency field.
Concrete, can be applicable to the antenna substrate material according to the nickel manganese cobalt spinel ferrite of first embodiment of the invention.Generally have the electric body antenna of luring of permitivity 6～7 and have about 2.65 cripetura than (ratios of the length of antenna and λ/2).In contrast, be suitable for according to the ferritic antenna of nickel manganese cobalt spinel of first embodiment of the invention because the characteristic of its high permitivity and magnetic susceptibility, have about 8.37 cripetura ratio.That is, when using nickel manganese cobalt spinel ferrite according to first embodiment of the invention as the antenna substrate material, antenna cripetura effect increases.
Fig. 5 represents to be adapted to according to the nickel manganese cobalt spinel ferrite of first embodiment of the invention as carrying out the suitable example of mimic on the antenna of one of electrical fittings.Concrete, Fig. 5 is expression will be suitable for according to the material of the ferritic antenna substrate material of first embodiment of the invention nickel manganese cobalt spinel and the permitivity 40 with same resonant frequency relatively the time, relatively the icon of resonant frequency and dB.Fig. 6 numeric representation is the form of these performancees.
The dB expression that descends downwards refers to that efficient increases in the resonant frequency field as shown in Figure 5, launches expression to the side and refers to that bandwidth (bandwidth) broadens.Known to Fig. 5, on efficient and bandwidth, has outstanding performance than the material of permitivity 40 according to the nickel manganese cobalt spinel ferritic phase of first embodiment of the invention.That is, utilize the bandwidth of the antenna of nickel manganese cobalt spinel ferrite of the present invention manufacturing to broaden as can be known and efficient also improves.In contrast, therefore the antenna of the material of suitable permitivity 40 does not look like and takes place because its resonance is very faint.
Can also confirm by Fig. 6, be suitable for that to compare the antenna of the material that is suitable for permitivity 40 with performance according to the bandwidth of the ferritic antenna of nickel manganese cobalt spinel of first embodiment of the invention outstanding, and can confirm the also outstanding characteristic of its gain (gain).
Fig. 7 is the block diagram of expression according to the nickel manganese cobalt spinel ferrite manufacture method of second embodiment of the invention.
For the nickel manganese cobalt spinel ferrite according to second embodiment of the invention is provided, nickel oxide, cobalt oxide, manganese oxide and ferric oxide are respectively with about 0.76: 0.006: 0.058: 1.14 mole (mol) provides (S710) than weighing.Preferably, at this, ferric oxide uses the ferric oxide of mean particle size less than 1 μ m.
With ball milling (ball mill) the above-mentioned nickel oxide that provides, cobalt oxide, manganese oxide and ferric oxide humidification in methyl alcohol (MeOH) is mixed about 48 hours (S720).
From this nickel oxide, cobalt oxide takes out powder (Fen Body in manganese oxide and the ferric oxide mixture), under about 120 ℃, dry about 12 hours (S730).
Pulverize exsiccant powder like this, make it become small-particle (S740).
Above-mentioned powder through drying and crushing will be through the heat treatment process first time.Thermal treatment is for the first time carried out (S750) under about 800 ℃ of temperature.
Through thermal treatment for the first time, thereby can further promote the thermal treatment of carrying out the afterwards second time to reach spinel ferrite synthetic process in the thermal treatment for the third time.
Through heat treated powder will be through the heat treatment process second time for the first time.Thermal treatment is for the second time carried out (S760) under about 1100 ℃ of temperature.
Will be through heat treated powder for the second time through heat treatment process for the third time.Thermal treatment is for the third time carried out (S770) under about 1150 ℃ of temperature.
Through said process, nickel oxide, cobalt oxide, manganese oxide and ferric oxide synthesize the spinel ferrite.
At this, Fig. 7 is a second embodiment of the invention, when reality is suitable of the present invention, be not limited thereto, the mol ratio of nickel oxide, cobalt oxide, manganese oxide and ferric oxide provided to 1.15 with 0.6 to 0.8: 0.005 to 0.007: 0.057 to 0.059: 1.13 respectively, the humidification blended time of carrying out is 45 hours to 50 hours, and powder is under 110 ℃ to 130 ℃ conditions, dry 11 hours to 13 hours.
In addition, thermal treatment for the first time can be carried out under 750 ℃ to 850 ℃, and thermal treatment for the second time also can be carried out under 1050 ℃ to 1150 ℃, and thermal treatment for the third time also can be carried out under 1100 ℃ to 1200 ℃.
As mentioned above, nickel manganese cobalt spinel ferrite according to a second embodiment of the present invention, promptly different with first embodiment of the invention, the employing mol ratio is 1.13 to 1.15 ferric oxide, the thermal treatment second time is reached 100 ℃ of thermal treatment temp minimizings for the third time and the nickel manganese cobalt spinel ferrite of manufacturing, as shown in Figure 8 in the saturating magnetic loss that has on the 230MHz below 0.02.
Further, have the saturating magnetic loss that reduces more than 0.02 compared with nickel manganese cobalt spinel ferrite, when being adapted on the antenna, can increase the efficient of antenna according to first embodiment of the invention according to the nickel manganese cobalt spinel ferrite of second embodiment of the invention.At this, be to be respectively 6 to 7 and 9 to 10 according to the ferritic permitivity of nickel manganese cobalt spinel and the magnetic susceptibility of second embodiment of the invention, thus identical with ferritic permitivity of nickel manganese cobalt spinel and magnetic susceptibility according to first embodiment of the invention.
As mentioned above, be to have low saturating magnetic loss and the low electric losses that lures according to the nickel manganese cobalt spinel ferrite of the first embodiment of the present invention and second embodiment, therefore can be applicable to the electrical fittings material, the concrete antenna substrate material etc. that is applicable in the high frequency field.
To sum up, be illustrated, but should understand, can carry out various modifications and changes to the present invention in inventive concept of in not exceeding following interest field, putting down in writing and the territory the practitioner in corresponding field with reference to the preferred embodiments of the present invention.
Claims (13)
1. one kind has low saturating magnetic loss and the nickel manganese cobalt spinel ferrite manufacture method of hanging down in the spinel ferrite manufacture method that lures electric losses, it is characterized in that, comprise,
The step of nickel oxide, cobalt oxide, manganese oxide and ferric oxide is provided;
Humidification mixes the step of described nickel oxide, described cobalt oxide, described manganese oxide and described ferric oxide in methyl alcohol;
From described nickel oxide, described cobalt oxide, described manganese oxide and described ferric oxide mixture, take out powder and carry out the exsiccant step;
Pulverize the step of described exsiccant powder;
And to described powder step of heat treatment.
2. nickel manganese cobalt spinel ferrite manufacture method according to claim 1 is characterized in that, carries out repeatedly in that described powder heat is carried out thermal treatment described in the treatment step.
3. nickel manganese cobalt spinel ferrite manufacture method according to claim 2, it is characterized in that described nickel oxide, described cobalt oxide, described manganese oxide and described ferric oxide are to provide to 1.06 mol ratio with 0.6 to 0.8: 0.005 to 0.007: 0.052 to 0.054: 1.04 respectively.
4. nickel manganese cobalt spinel ferrite manufacture method according to claim 2, it is characterized in that described nickel oxide, described cobalt oxide, described manganese oxide and described ferric oxide are to provide to 1.15 mol ratio with 0.6 to 0.8: 0.005 to 0.007: 0.057 to 0.059: 1.13 respectively.
5. nickel manganese cobalt spinel ferrite manufacture method according to claim 4 is characterized in that the mean particle size of described ferric oxide is less than 1 μ m.
6. according to each described nickel manganese cobalt spinel ferrite manufacture method in the claim 1 to 5, it is characterized in that described humidification mixing step is to carry out 45 hours to 50 hours with ball milling (ball mill).
7. according to each described nickel manganese cobalt spinel ferrite manufacture method in the claim 1 to 5, it is characterized in that the step of dry described mixture powder is under 110 ℃ to 130 ℃ conditions, dry 11 hours to 13 hours.
8. according to each described nickel manganese cobalt spinel ferrite manufacture method in the claim 1 to 5, it is characterized in that thermal treatment for the first time is to carry out in the described heat treatment step under 750 ℃ to 850 ℃ conditions.
9. nickel manganese cobalt spinel ferrite manufacture method according to claim 8 is characterized in that, after the described thermal treatment first time, carries out the thermal treatment second time under 1150 ℃ to 1250 ℃ conditions.
10. nickel manganese cobalt spinel ferrite manufacture method according to claim 8 is characterized in that, after the described thermal treatment first time, carries out the thermal treatment second time under 1050 ℃ to 1150 ℃ conditions.
11. nickel manganese cobalt spinel ferrite manufacture method according to claim 9 is characterized in that, after the described thermal treatment second time, carries out thermal treatment for the third time under 1200 ℃ to 1300 ℃ conditions.
12. nickel manganese cobalt spinel ferrite manufacture method according to claim 10 is characterized in that, after the described thermal treatment second time, carries out thermal treatment for the third time under 1100 ℃ to 1200 ℃ conditions.
13. a nickel manganese cobalt spinel ferrite is characterized in that, according to each described method manufacturing in the claim 1 to 5.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20080079133 | 2008-08-12 | ||
| KR10-2008-0079133 | 2008-08-12 | ||
| PCT/KR2009/004441 WO2010018955A2 (en) | 2008-08-12 | 2009-08-10 | Method for producing nickel manganese cobalt spinel ferrite having low permeation loss, and nickel manganese cobalt spinel ferrite produced by same |
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| Publication Number | Publication Date |
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| CN102105417A true CN102105417A (en) | 2011-06-22 |
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| CN2009801294442A Pending CN102105417A (en) | 2008-08-12 | 2009-08-10 | Method for producing nickel manganese cobalt spinel ferrite having low permeation loss, and nickel manganese cobalt spinel ferrite produced by same |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20110147643A1 (en) |
| EP (1) | EP2327674A4 (en) |
| JP (1) | JP2011529436A (en) |
| KR (1) | KR101045781B1 (en) |
| CN (1) | CN102105417A (en) |
| WO (1) | WO2010018955A2 (en) |
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| KR101547972B1 (en) * | 2014-01-09 | 2015-08-27 | 주식회사 이엔드디 | Manufacturing method for Ni-Co-Mn composite precursor |
| KR102079734B1 (en) * | 2017-01-26 | 2020-02-20 | 주식회사 엘지화학 | Ferrite catalyst for oxidative dehydrogenation, method for preparing the same and method of preparing butadiene using the same |
| CN109267114B (en) * | 2018-10-22 | 2020-08-21 | 中国科学院金属研究所 | Preparation method of cobalt-manganese spinel coating |
| WO2020101998A1 (en) | 2018-11-15 | 2020-05-22 | Rogers Corporation | High frequency magnetic films, method of manufacture, and uses thereof |
| WO2021011330A1 (en) | 2019-07-16 | 2021-01-21 | Rogers Corporation | Magneto-dielectric materials, methods of making, and uses thereof |
| US11679991B2 (en) | 2019-07-30 | 2023-06-20 | Rogers Corporation | Multiphase ferrites and composites comprising the same |
| TW202116700A (en) | 2019-09-24 | 2021-05-01 | 美商羅傑斯公司 | Bismuth ruthenium m-type hexaferrite, a composition and composite comprising the same, and a method of making |
| US11783975B2 (en) | 2019-10-17 | 2023-10-10 | Rogers Corporation | Nanocrystalline cobalt doped nickel ferrite particles, method of manufacture, and uses thereof |
| WO2021167785A1 (en) | 2020-02-21 | 2021-08-26 | Rogers Corporation | Z-type hexaferrite having a nanocrystalline structure |
| CN113045304A (en) * | 2021-03-25 | 2021-06-29 | 桂林电子科技大学 | Ferrite wave-absorbing material with mixed spinel structure and preparation method thereof |
| CN113548873B (en) * | 2021-08-13 | 2022-07-29 | 新乡学院 | Preparation method of manganese cobalt oxide ceramic material |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2010018955A2 (en) | 2010-02-18 |
| KR20100020412A (en) | 2010-02-22 |
| WO2010018955A3 (en) | 2010-07-01 |
| EP2327674A2 (en) | 2011-06-01 |
| US20110147643A1 (en) | 2011-06-23 |
| EP2327674A4 (en) | 2011-12-07 |
| JP2011529436A (en) | 2011-12-08 |
| KR101045781B1 (en) | 2011-07-04 |
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